The quality of a polyline can be described in the following terms:
- The number of points that make up the polyline
- The more points there are, the smoother the polyline (especially in curves).
- The floating-point precision of the points
- Points are specified as latitude and longitude values, which are represented in single-precision floating-point format. This works well for small values (which can be represented precisely), but precision decreases as values increase because of floating-point rounding errors.
Specifying polyline quality
When you call the ComputeRoutes() method, you use a
PolylineQuality
enumeration value to specify the quality of the polyline.
Use the HIGH_QUALITY value when you want to create a polyline composed of the
maximum number of points, to produce a polyline of the highest resolution. This
increased quality comes at the expense of response latency.
Use the OVERVIEW value when you want to create a low-resolution overview of
the route, which is a polyline composed of a minimal number of points. This
option produces responses with the lowest latency.
Example
The following example demonstrates how to set the polyline quality in the request body.
{
"origin":{
"location":{
"latLng":{
"latitude":37.419734,
"longitude":-122.0827784
}
}
},
"destination":{
"location":{
"latLng":{
"latitude":37.417670,
"longitude":-122.079595
}
}
},
"polylineQuality":"HIGH_QUALITY"
}